Use Startup Manager

A Restoring screen appears.


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You can keep an eye on this screen to monitor the restoration, which may take several hours or even overnight. Your Mac will restart automatically when Time Machine finishes restoring the backup. When you sign in to your account, you may have to go through a few setup screens, such a screen for signing in to your iCloud account or setting up Touch ID on a MacBook Pro.

Once the restore finishes and you follow the instructions to restart your Mac, you should be back where you were before the problem occurred.

Mac won't boot/start/turn on after macOS Catalina update

On the Restore From Time Machine screen, notice the text saying that the drive you restore onto will be erased. This is true—the entire volume will be erased and your Time Machine backup will be copied to it. While I was backing up my data, I learned from the link above that TM drive is itself bootable. I went ahead and tested it out, then got stuck on how to make the TM drive appear on the Startup Manager screen.

Are you suggesting that it is the tool I need to make my external TM drive bootable?

Check your Mac

But then why does disk utility mark my TM drive as bootable already? For encryption key, I have the key written down in a safe place so I'm sure I won't lose it.

But maybe the disk encryption is what prevents the external TM drive from being recognized as a startup option? The installer USB drive was to make your life easier.

2. Run a Power Cycle

I have one for each major OS release just in case! I guess I didn't quite make it clear.

Apple has altered things enough from the first generation of the recovery firmware within your Mac EFI as well as the OS you are likely encountering incorrect information from the guide. If you have the latest then the answer is true! You would be able to boot up under the TimeMachine backup but it would need to be unencrypted! Apple does not offer any means presently to encrypt a TimeMachine backup drive wise. I guess the easies way to think this through is the order of access.

Just like how you put your sox on before you put your shoes on the encryption of the drive needs to be after the drive is accessible.

How to fix macOS 10.15 Catalina problems

So here you would need to have first installed a full and proper OS on the drive then sure around and use the drive as your TimeMachine backup as the OS is not encrypted here the drive would boot and then when you got to the TimeMachine backup using a third party app you would have access to it. If you've had to replace it with a stock drive that has nothing on it—not even macOS—you won't be able to boot from the macOS Recovery Partition. But fear not, you can get the recovery rolling from the Time Machine backup disk itself: Just hold down the Option key when you start your Mac; you'll be able to select the Time Machine backup disk as your startup drive and go from there.

There are countless hard drives available that support Apple's Time Machine app for backup purposes.

How to restore from a Time Machine Backup

These three are among the best on the market. Just plug it in and you're halfway there! It's available in silver, space gray, and rose gold. The following hard drives are also among our favorites for LaCie is well known for its backup devices; this is one of the most popular on the market.

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